CS people what do you call // ?
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@futurebird I used to call it integer division until I learned that at least in Python it doesn't actually return an int.
Now I just call it The Thing That Looks Like It Does What I Need But Better Stay Away From.@martok this operator has returned an int since it was added in Python 2.2, so this seems weird?
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@futurebird Comment?
*ducks*
@futurebird Jokes aside, is it a floor or a towards-zero like the awful C "division" operator? That would affect proper naming a lot.
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CS people what do you call // ?
As in 16//5=3
* integer divide
* double divide
* floor
* floor divideI can't read this and not interpret // as a start-of-line-comment marker. So this line is just 16. And I call 16 an integer.
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@martok this operator has returned an int since it was added in Python 2.2, so this seems weird?
@jhominal Only if both arguments are int. If either is float, the result is float even if its value is by definition int-ish.
I still think this violates the Principle of Least Astonishment, that's why I just don't use it anymore. int(a/b) is not that much more typing.
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@futurebird nobody knows! There's like a zillion ways to do it because there isn't something like a
"
include <maths>
maths::pi
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CS people what do you call // ?
As in 16//5=3
* integer divide
* double divide
* floor
* floor divide@futurebird Years ago I got offered "show your Python skills" quiz on LinkedIn and the answer to this question was given as "integer division". I was so furious I put in a complaint. It is, of course, "floor division". And Python-style modulus is the One True '%' operator –C's remainder can get in the bin.
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no no no THIS is "hand crafted" ... only the finest pi made of the most dubious loops.
import random
import mathinside=0.0
resolution=60000
for i in range(resolution):
x,y = random.random(),random.random()
if math.sqrt(x*x+y*y)<1:
inside+=1
pi=4*inside/resolutionprint(pi)
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importing math feels very goofy. I should write a square root finder to avoid that. How do those go? It's like newton's method I think.
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@futurebird @yonder @ehproque Newton's method converges wonderfully quickly, so it's often a good place to start. I believe that CORDIC algorithms can also do square roots (although I haven't seen or derived one myself) -- those can be nicer for implementation if you don't have an FPU (or are building one), because they tend to be all about adds and bit-shifts and not much else.
CORDIC only generates one digit per iteration, though, whereas Newton doubles the precision each time.
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um... not really. What do you do? load a math library?
I mean, how much pi do we need? Just type out ten decimal places and make it a global.
@ehproque @futurebird i need more pi
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Can random.random() be stuck in a constexpr to do that at compile time or did someone rightfully shoot down the idea of compile time nonsererminism?
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@ehproque @futurebird i need more pi
@burnitdown @futurebird I'm out, but here's some cake
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Can random.random() be stuck in a constexpr to do that at compile time or did someone rightfully shoot down the idea of compile time nonsererminism?
We don't need any random numbers to be THIS terrible.
inside=0.0
resolution=100
for x in range(resolution):
x=x/resolution
for y in range(resolution):
y=y/resolution
if x*x+y*y<1:
inside+=1pi=4*inside/(resolution*resolution)
print(pi)
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@futurebird in all seriousnessness, the use of "floor divide" implies the result is rounded towards negative infinity, in contrast with "trunc divide" , which implies rounding toward zero, an important distinction when one operand turns out to be negative. Now here's a question: in your favorite languages, which way does integer divide behave? Does the language definition even require a particular behavior? (C90 and C99 for example call it "implementation defined". )
@llewelly @futurebird floor can also be defined as going toward zero.
Programmers are amazing at not knowing the foundations of things. I worked somewhere that was absolutely confounded by numpy’s use of statistical rounding (x.50 goes to the even value not up, to avoid biasing your data in a systematic manner). I, freshly graduated from college and having taken a stats course, knew what it was immediately.
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@llewelly @futurebird floor can also be defined as going toward zero.
Programmers are amazing at not knowing the foundations of things. I worked somewhere that was absolutely confounded by numpy’s use of statistical rounding (x.50 goes to the even value not up, to avoid biasing your data in a systematic manner). I, freshly graduated from college and having taken a stats course, knew what it was immediately.
I’m not pointing the “programmers […] not knowing […] things” at you specifically, @llewelly . That’s intended to be a completely separate thought. I’ve got blind spots large enough to park an aircraft carrier in, I’m sure.
@futurebird -
@ehproque @futurebird I'm an astronomer. Let's call it ten for now...
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We don't need any random numbers to be THIS terrible.
inside=0.0
resolution=100
for x in range(resolution):
x=x/resolution
for y in range(resolution):
y=y/resolution
if x*x+y*y<1:
inside+=1pi=4*inside/(resolution*resolution)
print(pi)
@futurebird you're comparing to 1 so you don't even need root here
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@futurebird you're comparing to 1 so you don't even need root here
OMG
You know, when I started writing this I had that in mind and just forgot about it... LMAO.
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@llewelly @futurebird floor can also be defined as going toward zero.
Programmers are amazing at not knowing the foundations of things. I worked somewhere that was absolutely confounded by numpy’s use of statistical rounding (x.50 goes to the even value not up, to avoid biasing your data in a systematic manner). I, freshly graduated from college and having taken a stats course, knew what it was immediately.
@c0dec0dec0de @futurebird imagine you descended to the basement of a strange building, and suddenly found yourself stuck to the ceiling. Such is the world of programming when not everyone agrees on the meaning of floor() ... *sigh*
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